Latent electrostatic image developing toner, image forming apparatus and image forming method

An electrostatic latent image and toner technology, which is applied in the field of electrostatic latent image development toner, can solve problems such as degradation, toner film-forming and fixing performance, and achieve good durability, less space, low-temperature fixing performance and heat resistance and storage performance effects

Inactive Publication Date: 2008-09-24
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, when more charge control agent is added to enhance chargeability, toner filming occurs and fixing performance decreases

Method used

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  • Latent electrostatic image developing toner, image forming apparatus and image forming method
  • Latent electrostatic image developing toner, image forming apparatus and image forming method
  • Latent electrostatic image developing toner, image forming apparatus and image forming method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0173] (preparation of masterbatch)

[0174] [0136] A masterbatch can be prepared by mixing and kneading a resin and a colorant while applying high shear force thereto. Organic solvents can be used to enhance the interaction between the colorant and the resin. Furthermore, a flushing method is preferably used. In the flushing method, an aqueous paste containing water and a colorant is mixed and kneaded with a resin and an organic solvent, so that the colorant moves to the resin, and the water and the organic solvent are removed. Therefore, it is not necessary to dry the colorant wet cake. Therefore, a flushing method is preferably used. For mixing and kneading, a high shear dispersing mixer such as a three-roll mill is preferably used.

[0175]

[0176] [0137] Any known antiblocking agent may be used in the toners described herein. Examples of the release agent include polyolefin waxes such as polyethylene wax and polypropylene wax; hydrocarbons having long chains such ...

Embodiment 1

[0317]

[0318] [0223] The following ingredients were charged into a container equipped with a thermometer and a stirrer: 96 parts of polyester (1); 32 parts of paraffin wax (melting point 72° C.); montmorillonite (CLAYTONAPA, manufactured by Southern Clay Inc., an inorganic layered mineral in which some of the interlayer ions are modified by a quaternary ammonium salt having a benzyl group) 8 parts; and ethyl acetate 383 parts. The mixture was stirred, heated to 80°C and held at 80°C for 5 hours. The mixture was cooled to 30°C within 1 hour. The mixture was transferred to different containers, and under the conditions of "3 pass" liquid transfer rate of 1 kg / hr, disc peripheral speed of 6 m / sec and 80% by volume loading of 0.5 mm zirconia beads, Bead mill (ULTRA VISCO MILL, manufactured by Aimex Co., Ltd.) dispersion. Component solution (1) is thus obtained. To 325 parts of ingredient solution (1) was added 338 parts of a 70% solution of polyester (1) in ethyl acetate an...

Embodiment 2

[0335] [0235] The electrostatic latent image developing toner (developer (2)) of the present invention is obtained in the same manner as in Example 1, except that P-1 is replaced with the first binder resin P-2 and the first resin The ratio of P-2 and the second resin PP-1 was varied. Table 1 shows the ratio (% by mass) of the first resin and the second resin in the obtained developer (2), the acid value of the first resin, the volume average particle diameter (Dv) and number of the toner. Average particle size (Dn), its ratio (Dv / Dn) and average circularity.

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PUM

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Abstract

A latent electrostatic image developing toner of the present invention is mainly composed of two or more binder resins, a colorant, a releasing agent and a layered compound. A first binder resin of the binder resins is a polyester resin with an acid value of 15 KOHmg/g or less. The layered compound is a compound in which at least some interlayer ions are modified by organic ions. Toner particles are prepared by granulation in an aqueous medium, and the layered compounds are localized in the surface of the particles by the pelletization in the granulation. The average circularity of the particles is 0.970 or more.

Description

technical field [0001] [0001] The present invention relates to electrostatic latent image developing toners. More particularly, the present invention relates to a latent electrostatic image developing toner that can be used in a small cleaner-less image forming apparatus that occupies less space and that can form stable high-quality images with less toner waste. The present invention also relates to a developer, a toner container, an image forming apparatus, and a printing ink cartridge (process cartridge) using the toner. Background technique [0002] [0002] A conventional contact fusion fixing method using a heating roller and the like has been widely used for fixing toner. A fixing device for a contact fusion fixing method with a heating roller and a pressure roller is provided. The fixing device fuses and fixes the toner image on the recording paper when the recording paper with the toner image passes through the pressure contact portion (nip) between the heating rolle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087G03G15/20
Inventor 野崎刚野崎千代志山本淳史松本光代门田拓也村上博之黑瀬克宣石川义通
Owner RICOH KK
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